So, did you work out the answer? If you need a clue then there is plenty of anniversary cake being shared round in the players' bar.

SPOILER ALERT - THE ANSWER IS JUST BELOW THIS PICTURE

Hammer time: Joe Cole is in his second stint at West Ham after leaving for Chelsea in 2003 before joining Liverpool and later Lille on a one-year loan spell

All the players in this team made permanent moves to their current club during last year's January window – except Norwich midfielder Leroy Fer whose transfer to Carrow Road took place in the summer. But he should have moved in January – Everton agreed a fee before pulling out of the deal because of worries about his medical.

THE LINE UP IN FULL

Jack Butland (Stoke City)

The kid keeper who was the surprise choice in Roy Hodgson's Euro 2012 squad switched from Birmingham to Stoke last January for £3.5million. Two loans later (back to Birmingham and then this season to Barnsley) he has finally made his Premier League debut for the Potters.

Jeepers keepers! Butland is finally making his make at the Britannia Stadium... after two loans spells he has made his Premier League debut

Stephen Kelly (Reading)

A key part of Fulham's run to the 2010 UEFA Cup Final, and then the regular right back for a while under Martin Jol, Republic of Ireland stalwart Kelly lost his place at Craven Cottage last season and was signed by Brian McDermott to help Reading's fight for survival. Stayed in the side under Nigel Adkins, and is still playing regularly now in the attempt to regain top flight status.

Royals appointment: Kelly spent six years with Tottenham before heading to Birmingham, Stoke, Fulham and, most recently, to Berkshire to join Reading

Mapou Yanga-Mbiwa (Newcastle)

Born in Central Africa but brought up near Marseille, the centre half had played nearly 200 games for Montpellier when Newcastle spent £8.5million as part of a January swoop to help Alan Pardew's side fight relegation. Aged 24, he has three full caps for France.

New kid in Toon: Yanga-Mbiwa joined Newcastle a year ago after making
nearly 200 appearances for Montpellier - and made headlines for a
rash tackle on Samir Nasri

John Stones (Everton)

Stones is the teenage prodigy who turned out to be David Moyes' parting gift to Everton. The former Goodison boss spent what could be a bargain £3million to bring in 6ft 2ins centre half Stones after he'd played just 24 League games for Barnsley. He's had to wait for his full debut but has been hugely impressive in Everton's last few games.

Bright future: Stones is beginning to make an impact on the first team at Everton after joining from South Yorkshire outfit Barnsley

Stephen Warnock (Leeds United)

One of the senior Aston Villa players bombed out by Paul Lambert to cut the wage bill, former England left back Warnock had spent the first half of last season on loan at Bolton before then Leeds boss Neil Warnock offered him a three-year deal at Elland Road.

Spot on: Warnock fires home a penalty against Millwall two months after joining the Elland Road club after making a permanent move away from Aston Villa

Yacouba Sylla (Aston Villa)

On the subject of Villa's reduced wage bill, Mali international midfielder Sylla was one of the bargain priced signings made by Lambert. It proved a good gamble as the 23-year-old who had been playing in France for Clermont made a contribution to the club's successful relegation fight.

Villan of the piece: Sylla made his name in France with Clermont before heading across the Channel to join Villa

Leroy Fer – THE ODD MAN OUT (Norwich)

The Dutch midfielder has put some steel in Norwich's side this season – but he had to wait for his Premier League move after a deal to join Everton fell through last January. David Moyes agreed an £8.5million fee with his club FC Twente, but then tried to renegotiate a deal based on appearances after Fer failed a medical. Twente called the whole thing off.

Odd man out: Fer came close to joining Everton last January but the deal fell through and he headed to Norfolk instead

Philippe Coutinho (Liverpool)

Chelsea wanted the creative force of quicksilver Brazilian Coutinho, but Liverpool moved quickest to tie up an £8.5million deal that saw the 21-year-old join their ranks. They had to wait to get him a work permit, but Coutinho, who had been on loan at Espanyol, put pen to paper on January 30th..

Wanted man: Chelsea were tracking Coutinho but it was Liverpool who moved most decisively to land the Inter Milan midfielder

Joe Cole (West Ham)

Brendan Rodgers wrapped up both Coutinho and Daniel Sturridge last January – meaning Joe Cole was among those who were surplus to requirements. Former Chelsea star Cole headed home to London and signed an 18 month contract at his first club West Ham.

Fortune's always hiding: Cole has gone back to his boyhood club after a failed spell up on Merseyside with Liverpool

Lewis Holtby (Tottenham)

The son of a British serviceman stationed in Germany, Holtby was scouted by Spurs for his performances with Schalke and, with his contract running out in the summer of 2013, had agreed to move to England then. That all changed when Andre Villas Boas decided he needed to strengthen his squad, and Holtby moved to White Hart Lane on January 28.

Forgotten man: Tottenham had to fight hard to land Holtby from Schalke, but he has so far failed to make his mark at White Hart Lane

Demba Ba (Chelsea)

Newcastle took advantage of a release clause in the Senegal international striker's contract at West Ham when they signed him for free in 2011 following the Hammers' relegation. What goes around, comes around – Ba's deal on Tyneside also had a get-out in it, and when Chelsea agreed to meet a £7million fee he was on his way to London.

Blue is the colour: Ba made an instant impact when he joined Newcastle after a spell with West Ham, then Chelsea came knocking in the winter window